Colin Calder, chief executive officer, PassivSystems

Colin has been in the computing industry for 30 years, 20 of which have been spent in the convergence of voice and data. He has provided strategic advice on wireless data to satellite and mobile phone operators. In 1996 he started his own company developing software for the mobile phone industry, which employed 63 members of staff, with offices in Europe and USA. He sold the company in March 2000 to phone.com (now called Openwave). In September 2008 after 15 months of extensive research Colin set up PassivSystems.